Instruction Manual
Tek-LCD 7801C
www.tek-trol.com
Technology Solutions
20
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The back panel is labelled with the I/O boards that were installed at the factory.
•
The removable connectors are labelled with the connection signal for each terminal.
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Figure 6 shows terminal connections of Tek
-LCD 7801C.
•
This model accepts (4) pulse and (8) analog inputs, and (10) 4-20 mA outputs and (10)
relays. (5) digital inputs, (4) digital outputs, RS-485 serial capability and USB connections
are standard on Tek-LCD 7801C NEMA 4X Multi-Channel Controller.
•
Ethernet is an option.
•
If all Input or Outpu
t slots are used exclusively for one function, the
Tek-LCD 7801C
NEMA 4X Multi-Channel Controller can accept up to (28) isolated 4-20 mA inputs, (28)
pulse inputs, (25) isolated 4-20 mA outputs, or (25) relays.
•
If used as a Modbus Client, Snooper, or Server only: (35) 4-20 mA outputs or (30) relays.
•
All units can be powered from AC or DC; both power connections can be used at the
same time.
•
The DC power supply can serve as backup power if the voltage is 24V or less, otherwise
the controller will run on DC power.
*Note:
1.
Each 4-20mA input has its own isolated 24VDC power supply to power the transmitter.
2.
Each 4-20mA output has its own isolated 24VDC power supply to power the output loop.
3.
Each relay is Form C and rated at 10 A.
4.
Input / output connections are m
ade to removable screw connectors.
5.
Every Tek-LCD 7801C has five digital inputs (additional digital inputs can be obtained by using the Pulse
Inputs), four digital outputs, RS-485 with Modbus.
6.
All Tek-LCD 7801C models can be powered from either AC or DC Power.
7.
Ethernet with Modbus TCP is an option.
8.
Micro USB is used for programming the Tek-LCD 7801C.
4.2
Power Connection
Power connections are made to one of the power terminal connectors. All units are capable of
being powered either by AC or by DC for the ranges specified.
4.2.1
90-264 VAC Power
•
Use three-
terminal power connector as shown in Figure 6.
•
Unit is protected internally with 1.25 A auto-resettable fuse.
•
2 A max, slow blow, 250 V min, UL Recognized external fuse recommended.
4.2.2
24 VDC Power ± 10%
•
Use two-
terminal power connector as shown in Figure
7.
•
Unit is protected internally with 3.7 A auto-
resettable fuse. 4 A max, slow blow, 50 V min,
UL Recognized external fuse recommended.
